Robert astley



(No Model.)

R. ASTLBY. GONSTRUGTIUN 0F PIREPROOP FLOORS. N0. 527,647. 'Patented0013. 16,1894.

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ROBERT ASTLEY, OF LONDON, ENGLAND.

CONSTRUCTION OF FIREPROOF FLOORS.

SPECIFICATION forming part of Letters Patent No. 527,647, dated October16, 1894.

Application tiled September 5, 1893. Serial No. 484.873. (No model.)

To all whom it may concern:

Beit known that I, ROBERT ASTLEY, a subject ot the Queen of GreatBritain, residing at 34 Ely Place, in the city of London, England, haveinvented certain ynew and useful Improvements in the Construction ofFireproot Floors, of which the following is a speciiication.

The object of this invention is to construct ireproof tloors in such amanner as to provide efcient protection in case of iire to the joistsand girders supporting them, which j oists and girders being made ofiron or steel are very apt to give way by bending when heated to anygreat extent. p

Now according to this invention I provide a number of joists ot' iron orother suitable metal about two feet apart and between the joists areplaced specially made ireclay lintels. These lintels are constructedwith a bottom iange grooved to receive the ceiling plaster and avertical central web having a roll on the top thereof. These lintels areplaced with their widest iianges horizontal to form a dat ceiling.Between the lintels are placed curved strips of corrugated iron the endsof which rest on the joists. On the corrugated iron strips is placed alayer of concrete flush with or covering the top of the joists and thusforming an arch springing from joist to joist without the aid oftemporary centering. Slots are cut in both ends of the lintels to allowthe flange of the same to pass under the bottom flange of joists andgirder and protect the same from fire.

In order that my said invention may bel fully understood I will proceedto explain the same with reference to the accompanying drawings, inwhich- Figure I representsalongitudinal section of a reproof floorconstructed according to this invention. Fig. II is a cross section ofsame. Figs. III and V are side views of lintel. Figs. IV and VI aresections of the same.-

The same letters denote the same parts in all the figures.

A is the main girder; B, the joists; C, the lintels; D, corrugated ironplaced on the joists; E, concrete resting on the corrugated iron D; F,flooring joists; G, wood iiooring boards; H, grooves in lintels toreceive ceiling plaster I; K, apertures in lintels for ven- Y tilation,an aperture in flange of same communicating with the room below ifdesired.

The lintels C which are made of' reclay or other material are providedwith slots Pat each end as shown at Figs. III and V to allow the flangeot' the same to pass under the j oists B, and main girder A, and protectthem from tire. The slots P are suiciently deep to allow of thelntelsbeing canted over so as to enable the flanges to be passed one under theother, and as the said lintels have only one upright web, they may beturned or slued to enable them to be placed in position after the joistsare xed.

When all the lintels except the last one in each bay have been placed onthe joists the flanges of each of the last four or tive are placed oneunder the other and the lintels being pushed up close leaves room forthe last one to be placed in position on the joists and the other fouror tive are afterward separated and placed in their proper positions.

To provide ventilation between the ceiling and the under sides of theconcrete arches, apertures K are formed in the web of the lintels C. Airbricks may be provided in one or more outer walls, to admit fresh air.

The vitiated air from between the ceiling and the concrete may beremoved by means of iues in the walls.

By forming apertures in the Iianges in two or more of thelntels the roomor rooms below may be ventilated by means of fines, which are connected,directly to the air chambers in the licor.

The object of placing the corrugated metal on the lower anges of thejoists B is to get the concrete well under the roll of the lintels sothat in case a lintel breaks from any cause it will still be held up bythe concrete.

What I claim as new, and desire to secure the accompanying drawings.

ROBT.V ASTLEY.

Witnesses:

A. E. JOHNSTON, T. E. HALEORD.

IOO

